Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d18f5c9c89de53…

MALICIOUS

PDF

90.7 KB Created: 2021-04-04 12:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e3596f4dd07503812e8ded085a8da7d SHA-1: 80de33ccfaf3eb5116c254b54efb52927ada714d SHA-256: 05d18f5c9c89de536a9d310a50d76526246e7211df21b6530d24f8f1d6c0d559
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, indicates a lure related to 'machine learning algorithms in python projects'. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=machine+learning+algorithms+in+python+projects PDF link annotation
    • https://cdn.sqhk.co/xisalaximel/ha6Qe0v/95121468297.pdfIn PDF document text
    • https://gurazelifu.weebly.com/uploads/1/3/0/8/130874247/9298575.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/83721883019.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/book_of_synonyms_and_antonyms_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/i5zjcXK/cross_stitch_saga_free_download.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/jee_main_mathematics_books_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/daFjdhh/96991131866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_6016516033fae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fef46a4b4f9e.pdfIn PDF document text
    • http://vikunokanafigul.66ghz.com/tabela_brasileiro_srie_b_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_6018ec0e5760f.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hx6Osgz/simulator_usa_2.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/5857174.pdfIn PDF document text
    • http://segijemidas.22web.org/john_deere_7200_planter_units_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xapanularopu/ibhbw5u/simasalezesajetap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapofekeba.rf.gd/begidiseraropiwo.pdfIn PDF document text
    • http://jasetaroxakil.rf.gd/56144920237.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/fusosafiru.pdfIn PDF document text
    • http://texokobatogu.epizy.com/81277562045.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 5528 bytes
SHA-256: 49db54195ebc69e71e83d37a62acebf424df752b16e0e633ca071a91ea8c35c2
font_01_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 11520 bytes
SHA-256: e51710450a52ddb0be3278ba08b3dcb3b12b25993920b3370069b92546425691
font_02_sfnt_off000147d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e